我国统计部门计算和公布的反映失业水平方面的指标是( )。
A．城镇实际失业率
B．城镇预期失业率
C．城镇登记失业率
D．城乡登记失业率
参考答案：C
— Pity you missed the lecture on nuclear pollution.
— I ________ it, but I was busy preparing for a job interview.[ ]
A. attended
B. had attended
C. would attend
D. would have attended
下列结构式中1.3-丁二烯是（）
A.CH2=CH-CH=CH2
B.CH2=CH-CH2-CH3
C.CH3-CH-C=CH2
D.CH2=CH2-CH-CH3
